NOTE: This package is compatible with the MongoDB nodejs driver versions 4 through 6 and supports MongoDB server versions 5 through 7.
npm install mongo-task-scheduler --save
Example:
const TaskScheduler = require('mongo-task-scheduler');
const scheduler = new TaskScheduler();Set the .databasePromise property to a function that returns a promise that (eventually) returns a mongodb database connection.
Example:
const MongoClient = require('mongodb').MongoClient;
const mongoUri = ...;
const mongoOptions = ...;
scheduler.databasePromise = function() {
// Return a promise to return a mongo database connection here...
return MongoClient.connect(mongoUri, mongoOptions);
};Use the .scheduleTask method to schedule a task and provide a processing method.
scheduler.scheduleTask(id, cronSchedule, worker)
Scheduling a task will cause the task scheduler to immediately start polling for work for that specified task. By default, the task scheduler looks for tasks that need running at once every second (configurable by overridding the .pollingInterval property). Polling will continue to occur until the .stopPolling() method is called.
The second parameter cronSchedule specifies the how often to run the task and uses cron syntax:
* * * * * *
┬ ┬ ┬ ┬ ┬ ┬
│ │ │ │ │ |
│ │ │ │ │ └ day of week (0 - 7) (0 or 7 is Sun)
│ │ │ │ └───── month (1 - 12)
│ │ │ └────────── day of month (1 - 31)
│ │ └─────────────── hour (0 - 23)
│ └──────────────────── minute (0 - 59)
└───────────────────────── second (0 - 59, optional)
The third parameter worker specifies the processing method for the task. When the task needs to be run, the provided processing method will be called.
Example (runs every morning at 5 AM):
scheduler.scheduleTask('daily-reminder', '0 5 * * *', function () {
// ... send the reminder here
// this can return a promise (chain) if needed.
});(The MIT License)
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